Hello, I was wondering if anyone could help me find some wiring diagrams for the xj8? Specifically for the front end that includes headlamps.

They're available on jagrepair.com, make sure to get the one for your MY car, there's some differences between each year

Does this help?
http://www.jagrepair.com/images/Auto.../jagxj2000.pdf

Yeah that's great! Thank you!